云南红土加筋效应研究

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1、第31卷第6期水利水电科技进展2011年12月V01．31No．6AdvancesinScienceandTechnolo~~ofWaterResourcesDec．20l1DOI：10．3880／j．issn．1006—7647．2011．06．010云南红土加筋效应研究黄英，符必昌，王海军，金克盛，张祖莲(昆明理工大学电力工程学院，云南昆明650500)摘要：针对云南加筋红土的三轴试验结果，研究排水条件、筋材种类、加筋层数等因素对云南红土加筋效果的影响。加筋效果采用加筋效果系数、归一化加筋效果系数和加权加筋效果系数来衡量。结果表

2、明：红土的加筋效果系数随围压的变化规律不显著，但归一化加筋效果系数的绝对值随围压的增大逐渐减小并趋向于零，强度和变形加权加筋效果系数随加筋层数的增加而增大。孔压加权加筋效果系数随加筋层数的增加而减小；红土在完全排水条件下加筋，强度加筋效果系数大于l，并随加筋层数的增加而增大；在固结不排水条件下加筋，强度和变形加筋效果系数都随加筋层数的增加逐渐增大，孔压加筋效果系数则随之逐渐减小；在完全不排水条件下加筋，强度和变形加筋效果系数都小于或等于l。认为红土的加筋机理可以从筋材在土体中所具有的隔离效应、阻力效应、拱效应、压密效应、孔压效应等几

3、个方面的综合作用来解释。关键词：加筋红土；排水条件；加筋效果；加筋机理中图分类号：TU432文献标识码：A文章编号：1006—7647(2011)o6—0035-06ReinforcementInechanimnofYunnanlaterite／／HUANGYing，FUBi—chang，wANGHai-ju．，JINKe-sheng，ZHANGZu-lian(KunmingUniversofScienceandTechnology，Kunming65O500，China)Abstract：Basedontheresultsoftr

4、iaxialtestsonreinforcedYunnanlaterite。theefectsofdrainageconditions，reinforcingmaterialsandgeogridlayersonthereinforcementofYunnanlateritewerestudied．卟ereinforcementefectsweremeasuredbymeansofthecoeficientsofreinforcementefects．normalizedreinforcementefectsandweightedr

5、einforcementefects．田Ieresultsshowsthatthecoefficientofthereinforcementefectsdoesn’tchangee~denflywiththechangeofconfiningpressure，butthecoeficientofthenormalizedreinforcementefectsdecreasesandtendstozeIowhentheconfiningpressureincrea$~s．rhecoefcientsoftheweightedreinfo

6、rcementefectsofstrengthanddeformationinereasebutthoseofporepressuredecreasewiththeincreaseofthegeogridlayers．Forthecompletelydrainedreinforcedlateritesamples，thecoeficientofthestrengthreinforcementefectsiSlargerthan1andincreaseswiththeincreaseofthelayers．Fortheconsolid

7、atedandundrainedreinforcedlateritesamples．thecoeficientsofbo山thestrengthanddeformationreinforcementefectsincreasebutthoseoftheporepressuredecreasewiththeincreaseofthegeogridlayers．Forthecompletelyundrainedreinforcedsamples，thecoeficientsofboththes~engthanddeformationre

8、inforcementefectsarenotlargerthan1．，n1ereinforcementmechanismoflateriteCanbeinterpretedfromt}leaspectsofisolationefec